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Finding the Fourth Proportional to 77,879.81, 107,474.04 and 42,069.81

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Solution

The fourth proportional to 77,879.81, 107,474.04 and 42,069.81 is: 58,056.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,879.81 : 107,474.04 = 42,069.81 : x
  2. Step 2: Convert to fraction form
    77,879.81/107,474.04 = 42,069.81/x
  3. Step 3: Cross multiply
    77,879.81x = 107,474.04 × 42,069.81
  4. Step 4: Simplify right side
    77,879.81x = 4,521,412,442.73
  5. Step 5: Solve for x
    x = 4,521,412,442.73/77,879.81
  6. Step 6: Final answer
    x = 58,056.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.